Lighting device and vehicular headlamp

Patent metadata

Field	Value
Publication number	US-10962190-B2
Application number	US-201716309110-A
Country	US
Kind code	B2
Filing date	Apr 4, 2017
Priority date	Jul 15, 2016
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A lighting device includes a light emitting element; a first lens that captures and emits light generated by the light emitting element; and a second lens that captures light emitted from the first lens and emits the light in a predetermined direction. The first lens includes a first-lens-entrance through which the light generated by the light emitting element enters, a first lens exit that emits the light entered from the first-lens-entrance and transmitted through an inside of the first lens, and a plurality of first-lens-side-portion-wall-surfaces that are provided between the first-lens-entrance and the first lens exit. The plurality of first-lens-side-portion-wall-surfaces include a reflection-side-surface-portion that reflects the light entered the inside of the first lens from the first-lens-entrance, and a side surface portion that is configured to allow light having a luminous intensity smaller than a luminous intensity of light entering the reflection-side-surface-portion to enter.

First claim

The invention claimed is:

1. A lighting device comprising:
a light emitting element;
a first lens that captures and emits light generated by the light emitting element; and
a second lens that captures light emitted from the first lens and emits the light in a predetermined direction,
wherein the first lens includes
a first lens entrance through which the light generated by the light emitting element enters,
a first lens exit that emits the light entered from the first lens entrance and transmitted through an inside of the first lens, and
a plurality of first lens side portion wall surfaces that are provided between the first lens entrance and the first lens exit, and

wherein the plurality of first lens side portion wall surfaces include
a reflection side surface portion that reflects the light entered the inside of the first lens from the first lens entrance, and
a side surface portion that is configured to allow light having a luminous intensity smaller than a luminous intensity of light entering the reflection side surface portion to enter, and

wherein the side surface portion is formed to be away from a horizontal line passing through a center of the light emitting element from the first lens entrance toward the first lens exit.

2. The lighting device of claim 1 ,
wherein the first lens entrance has a recessed shape surrounding a periphery of the light emitting element, and includes
a first entrance surface that is a bottom surface of the recessed shape, and
a second entrance surface that is a side surface of the recessed shape,

wherein the reflection side surface portion of the plurality of first lens side portion wall surfaces includes
a first reflection surface that reflects the light entered the second entrance surface, and
a second reflection surface that reflects the light entered the first entrance surface and the light reflected by the first reflection surface, and

wherein the side surface portion of the plurality of first lens side portion wall surfaces is configured to allow light having a luminous intensity smaller than a luminous intensity of the light entering the first reflection surface and the second reflection surface to enter.

3. The lighting device of claim 2 ,
wherein the second reflection surface of the first lens is provided with a step.

4. The lighting device of claim 2 ,
wherein a second lens exit included in the second lens is provided with a plurality of depressions having a spherical shape, an elliptical spherical shape, or a quadrangular pyramid shape.

5. The lighting device of claim 2 ,
wherein a second lens exit included in the second lens is provided with a periodic structure having a wave shape or a conical shape.

6. A vehicular headlamp configured by combining a combination of
a plurality of the lighting devices of claim 2 , so that light emitted from the second lens of the respective lighting devices overlap each other.

7. The lighting device of claim 1 ,
wherein a second lens exit included in the second lens includes a curved surface having a projection shape toward a side opposite to the light emitting element, and an undulation of a deviation amount from the curved surface having a size of 1 micron or more and 100 microns or less is formed on the curved surface.

8. The lighting device of claim 1 ,
wherein the second lens includes a second lens side portion wall surface provided between a second lens entrance and a second lens exit included in the second lens, and
wherein a light shielding member for shielding light toward the second lens side portion wall surface is provided on an outer edge of the second lens entrance.

9. The lighting device of claim 1 ,
wherein the second lens includes a second lens side portion wall surface provided between a second lens entrance and a second lens exit included in the second lens, and
wherein an uneven structure for diffusing light is formed on the second lens side portion wall surface.

10. A vehicular headlamp including a plurality of lighting devices, the plurality of lighting devices including at least first, second and third lighting devices, each comprising:
a light emitting element;
a first lens that captures and emits light generated by the light emitting element; and
a second lens that captures light emitted from the first lens and emits the light in a predetermined direction,
wherein the first lens includes
a first lens entrance through which the light generated by the light emitting element enters,
a first lens exit that emits the light entered from the first lens entrance and transmitted through an inside of the first lens, and
a plurality of first lens side portion wall surfaces that are provided between the first lens entrance and the first lens exit, and

wherein the plurality of first lens side portion wall surfaces include
a reflection side surface portion that reflects the light entered the inside of the first lens from the first lens entrance, and
a side surface portion that is configured to allow light having a luminous intensity smaller than a luminous intensity of light entering the reflection side surface portion to enter

wherein the first lens entrance has a recessed shape surrounding a periphery of the light emitting element, and includes
a first entrance surface that is a bottom surface of the recessed shape, and
a second entrance surface that is a side surface of the recessed shape,

wherein the reflection side surface portion of the plurality of first lens side portion wall surfaces includes
a first reflection surface that reflects the light entered the second entrance surface, and
a second reflection surface that reflects the light entered the first entrance surface and the light reflected by the first reflection surface, and

wherein the side surface portion of the plurality of first lens side portion wall surfaces is configured to allow light having a luminous intensity smaller than a luminous intensity of the light entering the first reflection surface and the second reflection surface to enter,
wherein light emitted from the second lens of each of the respective lighting devices overlaps each other,
wherein in the first and second lighting devices:
the first lens entrance has a recessed shaped surrounding a periphery of the light emitting element, and includes
a first entrance surface that is a bottom surface of the recessed shape, and
a second entrance surface that is a side surface of the recessed shape,

the reflection side surface portion of the plurality of first lens side portion wall surfaces includes
a first reflection surface that reflects the light entered the second entrance surface, and
a second reflection surface that reflects the light entered the first entrance surface and the light reflected by the first reflection surface, and

the side surface portion of the plurality of first lens side portion wall surfaces is configured to allow light having a luminous intensity smaller than a luminous intensity of the light entering the first reflection surface and the second reflection surface to enter,

wherein the first lighting device has the first lens provided with a step on the second reflection surface,
wherein the second lighting device has the first lens provided with a step on the second reflection surface, and the second lens provided with a plurality of depressions having a spherical shape, or an elliptical spherical shape, or a quadrangular pyramid shape on a second lens exit, and
wherein the third lighting device has the second lens provided with a periodic structure having a wave shape or a conical shape on a second lens exit.

11. The vehicular headlamp of claim 10 ,
wherein in

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Matsuda Takashi
• Kasano Masahiro

Classifications

• F21S41/27

  Thick lenses · CPC title

• F21S41/26

  Elongated lenses · CPC title

• F21W2102/13

  for high-beam region or low-beam region · CPC title

• F21S41/322

  the reflector using total internal reflection · CPC title

• F21S41/24

  Light guides · CPC title